From a2ee3d483a0a970924d41cfa5b2c7e1a84c2759c Mon Sep 17 00:00:00 2001
From: John McFarlane <git@john.mcfarlane.name>
Date: Tue, 8 Feb 2022 18:44:35 +0000
Subject: [PATCH] 911 fix supplied by @vrqq

---
 include/cnl/_impl/num_traits/scale.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/cnl/_impl/num_traits/scale.h b/include/cnl/_impl/num_traits/scale.h
index dd32a72f6..fca7eef53 100644
--- a/include/cnl/_impl/num_traits/scale.h
+++ b/include/cnl/_impl/num_traits/scale.h
@@ -46,6 +46,18 @@ namespace cnl {
             : _impl::default_scale<Digits, Radix, S> {
     };
 
+    template<int Digits, int Radix, template<typename, typename>
+    class TNUM, typename S, typename Tag>
+    struct scale<Digits, Radix, TNUM<S, Tag>, _impl::enable_if_t<(
+        Digits<0 && cnl::_impl::is_integral<S>::value)>>
+    {
+        CNL_NODISCARD constexpr auto operator()(TNUM<S, Tag> const& s) const
+        -> decltype(s/_impl::power_value<S, -Digits, Radix>())
+        {
+            return s/_impl::power_value<S, -Digits, Radix>();
+        }
+    };
+
     namespace _impl {
         // cnl::_impl::scale - convenience wrapper for cnl::scale
         template<int Digits, int Radix=2, class S>